| 单词 | smectite group |
| 释义 | > as lemmassmectite group b. = montmorillonoid n. So smectite group = montmorillonite group n. at montmorillonite n. Compounds. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > smectites montmorillonite group1938 montmorillonoid1951 smectite1955 1955 G. Brown in Clay Minerals Bull. II. 296 Smectites is the name proposed for the minerals at present variously known as montmorillonoids, montmorins, minerals of the montmorillonite group and frequently even montmorillonites. Smectites are defined as minerals composed of 2:1 or triphormic layers, which, when the readily exchangeable cations are replaced by Na+ and the material is saturated with glycerol, give a basal spacing of 18Å approximately. 1957 R. Greene-Kelly in R. C. Mackenzie Differential Thermal Investigation of Clays v. 140 By far the most abundant dioctahedral smectite is montmorillonite. 1966 W. A. Deer et al. Introd. Rock-forming Minerals iii. 264 An alternative term once used for this type of clay [sc. montmorillonoids] is ‘smectite’, and this has now been revived to describe the group as a whole.., which contains the following principal members: montmorillonite, beidellite, nontronite, saponite, hectorite and sauconite. 1975 Amer. Mineralogist 60 66/1 The significant chemical and physical properties of smectites often depend on the nature of the interlayer exchange ions. 1979 Sci. Amer. Apr. 78/1 (caption) Smectite group of clay minerals, formerly called the montmorillonite group, has extremely fine-grained, irregular and thin-layered crystals. < as lemmas |
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